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use std::collections::HashMap;
use std::marker::PhantomData;
use std::sync::{Arc, RwLock};
use failure::format_err;
use crate::ecs::{Component, ComponentBackend, ComponentManager, Entity, EntityBackend};
use crate::snowflake::Snowflake;
use crate::util::Result;
pub struct LocalEntityStorage<T: Entity + Clone + 'static> {
data: RwLock<HashMap<Snowflake, T>>,
}
impl<T> LocalEntityStorage<T>
where
T: Entity + Clone + 'static,
{
pub fn new() -> LocalEntityStorage<T> {
LocalEntityStorage {
data: RwLock::new(HashMap::new()),
}
}
}
impl<T> EntityBackend<T> for LocalEntityStorage<T>
where
T: Entity + Clone + 'static,
{
fn exists(&self, id: Snowflake) -> Result<bool> {
let data = self.data.read().unwrap();
Ok(data.contains_key(&id))
}
fn load(&self, id: Snowflake, _cm: Arc<ComponentManager<T>>) -> Result<Option<T>> {
let data = self.data.read().unwrap();
Ok(data.get(&id).map(|v| v.clone()))
}
fn store(&self, id: Snowflake, obj: &T) -> Result<()> {
let mut data = self.data.write().unwrap();
data.insert(id, obj.clone());
Ok(())
}
fn delete(&self, id: Snowflake) -> Result<()> {
let mut data = self.data.write().unwrap();
data.remove(&id);
Ok(())
}
fn keys(&self, page: u64, limit: u64) -> Result<Vec<Snowflake>> {
let mut ids: Vec<Snowflake>;
let data = self.data.read().unwrap();
ids = data.keys().copied().collect();
drop(data);
ids.sort_unstable();
Ok(ids
.into_iter()
.skip((page * limit) as usize)
.take(limit as usize)
.collect())
}
}
pub struct LocalComponentStorage<T, U>
where
T: Entity + 'static,
U: Component<T> + Clone + 'static,
{
data: RwLock<HashMap<Snowflake, U>>,
pd: PhantomData<T>,
}
impl<T, U> LocalComponentStorage<T, U>
where
T: Entity + 'static,
U: Component<T> + Clone + 'static,
{
pub fn new() -> LocalComponentStorage<T, U> {
LocalComponentStorage {
data: RwLock::new(HashMap::new()),
pd: PhantomData,
}
}
}
impl<T, U> ComponentBackend<T, U> for LocalComponentStorage<T, U>
where
T: Entity + 'static,
U: Component<T> + Clone + 'static,
{
fn load(&self, entity: &T) -> Result<Option<U>> {
let data_map = self
.data
.read()
.map_err(|_e| format_err!("storage lock poisoned"))?;
Ok(data_map.get(&entity.id()).map(|x| x.clone()))
}
fn store(&self, entity: &T, component: U) -> Result<()> {
let mut data_map = self
.data
.write()
.map_err(|_e| format_err!("storage lock poisoned"))?;
data_map.insert(entity.id(), component);
Ok(())
}
fn exists(&self, entity: &T) -> Result<bool> {
let data_map = self
.data
.read()
.map_err(|_e| format_err!("storage lock poisoned"))?;
Ok(data_map.contains_key(&entity.id()))
}
fn delete(&self, entity: &T) -> Result<()> {
let mut data_map = self
.data
.write()
.map_err(|_e| format_err!("storage lock poisoned"))?;
data_map.remove(&entity.id());
Ok(())
}
}